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For the (prior) questionnaire studies, all claimants and physicians gave informed consent.
At each interview, participants reported on symptoms over the past 4 months since the prior questionnaire [ 14, 15].
These critiques are best illustrated by remarks from claimants in our prior questionnaire study among 63 claimants [ 16].
As no prior questionnaire existed, a self-administered questionnaire including six main domains and 143 items, based on a literature review, was designed by the research team.
When our detailed assessment was not included on biennial questionnaires we carried physical activity data forward from the prior questionnaire cycle (for example, 1988 data used in 1990-92 follow-up).
The questionnaire used in this study has not been formally validated, although it did show good internal reliability and was based in large part on a prior questionnaire, which reported excellent feasibility of administration and good face and construct validity [ 7].
Similar(5)
The analysis of the findings has allowed us to explain the significance of certain specific problems in the implementation of the GRADE method, some of which had already been detected through a prior questionnaire-based study.
Missing information on a questionnaire was carried forward from available information on prior questionnaires.
Thus, in our models we carried forward values from prior questionnaires.
The questionnaire used in this study was developed specifically for this purpose but was based on prior questionnaires [ 12, 15].
Participants provided written informed consent prior to questionnaire completion and no participation incentives were offered.
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